Your feedback is useful. I am aware the UI is confusing.
You mentioned you would like to have more time. You can actually get more time by changing your equipment in Hub area - Sealing Chamber.
My guess is you completely missed out on that, because of my bad ui design, and overwhelming text. There are over 60 different equipment implemented in the game (holding right click over buttons gives more detailed explanations). They can boost your gold game, add more time, give more mana, speed up mana regeneration, add additional abilities, and more.
If you would like to take it slow to learn the movement, and familiarize yourself with different dungeon rooms, there is also an option to play with unlimited time before you enter the dungeon (but you gain no gold).
I am going to need to come up with ways to make menus less confusing. Thank you for playing.